Hi is there any way I can paste the yanked text from a vim buffer to a vim command line, as I need to search for some file names which appear in current open text and I have to manually type the file name after :e

The last one is the most useful -- with it you can either use q; or ;;; to access the command line history; and if you've already started typing a command then you can quickly hit ;; and gain access to your familiar vim keys. I find this easier than memorising a bunch of key chords (if I wanted that, I'd be using emacs).